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Is bank 1 sensor 1 up or downstream?

Bank 1 Sensor 1 means Upstream Right/Rear;Bank 2 Sensor 1 means Upstream Left/Front;Bank 1 Sensor 2 means Downstream Right/Rear;Bank 2 Sensor 2 means Downstream Left/Front.


Is O2 sensor bank 1 sensor 1 upstream or downstream?

Sensor 1 is the upstream oxygen sensor. It is the sensor that measures the oxygen content in the exhaust, providing an input to the computer, which determines how to adjust the air/fuel ratio. Sensor 1 is the sensor closest to the engine. Sensor 2 is the downstream oxygen sensor.


How many o2 sensors does a 2002 Acura MDX have?

Apparently on the ’02 MDX, there are only 2 02 sensors and only 1 catalytic converter. Both 02 sensors are located at the catalytic converter, which is bolted to the exhaust pipe underneath the front seat passenger.


Do I need to replace both O2 sensors?

Manufacturers recommend replacing O2 sensors in pairs (both Upstream or both Downstream). An older, slower sensor can cause an imbalance in the engine management system, leading to poor fuel economy and possible damage to the catalytic converter.


How do I know if it’s my upstream or downstream O2 sensor?


Can you drive without a upstream o2 sensor?

Can you drive without an upstream o2 sensor? Yes, you can drive for a short distance without an upstream o2 sensor. However, for a long drive, the ECU would detect there is no fuel in the exhaust and hence would inject more fuel to compensate.


What does code P0420 Bank 1 mean?

The P0420 code signals a low catalyst system efficiency. This code suggests that the oxygen levels are below the desired threshold (Bank 1), which most often results from problems with your car’s exhaust or fuel systems. It can sometimes be tricky to diagnose.

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What is a bank 1 catalytic converter?

The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. Bank 1 refers to the side of the engine that houses the number one cylinder. The opposite side of the engine is Bank 2.


How many O2 sensors does an Acura MDX have?

You will have an oxygen sensor before and after each catalytic converter. So, you’ll have a total of 4.


How many oxygen sensors does a 2003 Acura MDX have?

According to the 2003/2004 Maintenance manual, there are four 02 sensors. Two sensors are located immediately upstream of both of the warm up three way catalytic converters, which are attached to the exhaust manifold on each bank of the engine.